com.isotrol.impe3.core.component.PropertyInjectors.java Source code

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Here is the source code for com.isotrol.impe3.core.component.PropertyInjectors.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.isotrol.impe3.core.component;

import java.lang.reflect.Method;
import java.util.List;

import org.springframework.util.StringUtils;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.isotrol.impe3.api.Portal;
import com.isotrol.impe3.api.component.Component;
import com.isotrol.impe3.api.component.InjectProperty;

/**
 * Collection of property injectors.
 * @author Andres Rodriguez
 * @param <T> Target component type.
 */
public final class PropertyInjectors<T extends Component> extends Injectors<T> {
    private final ImmutableList<PropertyInjector> injectors;

    static <T extends Component> PropertyInjectors<T> of(Class<T> type, Iterable<Method> methods) {
        return new PropertyInjectors<T>(type, filter(methods, InjectProperty.class));
    }

    private PropertyInjectors(Class<T> type, Iterable<Method> methods) {
        super(type);
        final List<PropertyInjector> list = Lists.newLinkedList();
        for (Method method : methods) {
            list.add(new PropertyInjector(method));
        }
        this.injectors = ImmutableList.copyOf(list);
    }

    @Override
    public boolean isEmpty() {
        return injectors.isEmpty();
    }

    /**
     * Performs the property injection.
     * @param target Target object.
     * @param portal Source portal.
     */
    public void inject(Object target, Portal portal) {
        for (PropertyInjector i : injectors) {
            i.inject(target, portal);
        }
    }

    /**
     * Injector for portal properties.
     * @author Andres Rodriguez
     */
    private final class PropertyInjector extends Injector {
        /** Property name. */
        private final String name;
        /** Whether an engine mode-dependent injection is requested. */
        private final boolean modeDependent;

        PropertyInjector(final Method method) {
            super(method);
            final InjectProperty ann = method.getAnnotation(InjectProperty.class);
            this.name = ann.value();
            this.modeDependent = ann.modeDependent();
            if (!StringUtils.hasText(name) || !String.class.equals(getParameterType())) {
                throw new IllegalInjectionMethodException(getType(), method);
            }
        }

        /**
         * Performs the parameter injection.
         * @param target Target object.
         * @param portal Source portal.
         */
        void inject(Object target, Portal portal) {
            final Object value = modeDependent ? portal.getMDProperty(name) : portal.getProperty(name);
            if (value != null) {
                invoke(target, value);
            }
        }
    }
}